/*
 * Copyright 2014-2021 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.data.keyvalue.core;

import org.springframework.data.keyvalue.core.query.KeyValueQuery;
import org.springframework.lang.Nullable;

/**
 * Resolves the criteria object from given {@link KeyValueQuery}.
 *
 * @author Christoph Strobl
 * @author Mark Paluch
 * @param <T>
 */
public interface CriteriaAccessor<T> {

	/**
	 * Checks and reads {@link KeyValueQuery#getCriteria()} of given {@link KeyValueQuery}. Might also apply additional
	 * transformation to match the desired type.
	 *
	 * @param query must not be {@literal null}.
	 * @return the criteria extracted from the query. Can be {@literal null}.
	 * @throws IllegalArgumentException in case the criteria is not valid for usage with specific
	 *           {@link CriteriaAccessor}.
	 */
	@Nullable
	T resolve(KeyValueQuery<?> query);
}
